Holopneustes purpurascens
Short-spine urchin | Holopneustes pycnotilus
Distribution
Temperate Australasia
Description
Brown test, pink spines and yellow suckers at the tips of the tube feet. Like the other two Holopneustes species, it is locally abundant below low-water mark but is easily overlooked because it generally remains concealed among algal fronds.
Information
Max Size: 6 cm
Sea Temperature Range: 12.5-24.6°C
Depth: 0-8m
Habitat Generalization Index: N/A
Also referred to as the SGI (Species Generalisation Index), this describes the habitat niche breadth of the species. Species with values less than 15 are found in a relatively narrow range of reef habitat types (specialists), while those over 25 may be found on most hard substrates within their range (generalists). Learn more here.
Conservation and Rarity
IUCN Status: Not Evaluated
Occurrence: Frequent (14.5% of sites)
Occurrence describes how often the species is found on surveys within its distribution. It is calculated as the % of reef sites surveyed by RLS divers across all the ecoregions in which the species has been observed
Abundance: Few (3 per transect)
Abundance is calculated as the average number of individuals recorded per RLS transect, where present.
Edit by: GJ Edgar. 2008. Australian Marine Life. New Holland, Sydney